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Related Concept Videos

Aggression01:47

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Humans engage in aggression when they seek to cause harm or pain to another person. Aggression takes two forms depending on one’s motives: hostile or instrumental. Hostile aggression is motivated by feelings of anger with intent to cause pain; a fight in a bar with a stranger is an example of hostile aggression. In contrast, instrumental aggression is motivated by achieving a goal and does not necessarily involve intent to cause pain (Berkowitz, 1993); a contract killer who murders for...
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A body temperature above  38°C  (100.4 °F) is known as fever or pyrexia, and a person with fever is termed 'febrile.' Typically, the hypothalamus, a part of the brain that acts as the body's thermostat, regulates body temperature through a thermoregulatory setpoint. It receives signals from cold and warm thermal receptors throughout the body and adjusts the body's temperature accordingly. Fever occurs when this hypothalamic setpoint is altered, usually in...
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Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
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Global change may make hostile - Higher ambient temperature and nitrogen availability increase ant aggression.

Patrick Krapf1, Wolfgang Arthofer1, Manfred Ayasse2

  • 1Molecular Ecology Group, Department of Ecology, University of Innsbruck, Technikerstr. 25, Innsbruck 6020, Austria.

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Summary

Global change impacts ant aggression. Rising temperatures and nitrogen levels correlate with increased aggression in high-elevation ants, suggesting future behavioral shifts in alpine ecosystems.

Keywords:
Aggressive behaviourClimate changeHigh elevationSocial structureTetramorium alpestre

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Area of Science:

  • Ecology
  • Animal Behavior
  • Evolutionary Biology

Background:

  • Organismal behavior, including aggression, is a response to environmental stimuli and crucial for survival.
  • Behavioral plasticity enables adaptation to environmental changes, vital for species facing global shifts like rising temperatures and eutrophication.
  • High-elevation ecosystems and their inhabitants, such as ants, are particularly sensitive to global change impacts.

Purpose of the Study:

  • To investigate the influence of environmental and genetic factors on the aggressive behavior of the high-elevation ant Tetramorium alpestre.
  • To determine if aggression levels and associated proxies differ across populations of T. alpestre along an elevational gradient.
  • To test the hypothesis that environmental factors, rather than social structure, drive variations in aggressive behavior.

Main Methods:

  • Correlative analysis of eight T. alpestre populations across European Alps elevations.
  • Assessment of genetic relatedness (within- and across-colony), cuticular hydrocarbons, and body size.
  • Measurement of environmental proxies including geographic distance, air temperature, and worker nitrogen-isotope values, alongside within-population aggression.

Main Results:

  • Aggression and some environmental proxies varied significantly among populations, while genetic proxies did not.
  • Positive correlations were found between worker aggression and both air temperature and worker nitrogen-isotope values.
  • Environmental factors, specifically temperature and nitrogen availability, influenced aggression, independent of social structure variations (single- vs. multiple-queen colonies).

Conclusions:

  • Environmental changes, not social structure, appear to be the primary driver of altered aggressive behavior in T. alpestre.
  • Global change, through increased temperature and nitrogen, is inferred to affect aggression in this high-elevation ant species.
  • Future increases in temperature and nitrogen may lead to heightened aggression in T. alpestre and other alpine species, impacting ecosystem dynamics.